int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
int index;
int err;
again:
if (!idr_pre_get(&mmu_context_idr, GFP_KERNEL))
return -ENOMEM;
spin_lock(&mmu_context_lock);
err = idr_get_new_above(&mmu_context_idr, NULL, 1, &index);
spin_unlock(&mmu_context_lock);
if (err == -EAGAIN)
goto again;
else if (err)
return err;
if (index > MAX_CONTEXT) {
spin_lock(&mmu_context_lock);
idr_remove(&mmu_context_idr, index);
spin_unlock(&mmu_context_lock);
return -ENOMEM;
}
/* The old code would re-promote on fork, we don't do that
* when using slices as it could cause problem promoting slices
* that have been forced down to 4K
*/
if (slice_mm_new_context(mm))
slice_set_user_psize(mm, mmu_virtual_psize);
mm->context.id = index;
return 0;
}
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
int index;
index = __init_new_context();
if (index < 0)
return index;
if (slice_mm_new_context(mm))
slice_set_user_psize(mm, mmu_virtual_psize);
subpage_prot_init_new_context(mm);
mm->context.id = index;
#ifdef CONFIG_PPC_ICSWX
mm->context.cop_lockp = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
if (!mm->context.cop_lockp) {
__destroy_context(index);
subpage_prot_free(mm);
mm->context.id = MMU_NO_CONTEXT;
return -ENOMEM;
}
spin_lock_init(mm->context.cop_lockp);
#endif
return 0;
}
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
int index;
index = __init_new_context();
if (index < 0)
return index;
/* The old code would re-promote on fork, we don't do that
* when using slices as it could cause problem promoting slices
* that have been forced down to 4K
*/
if (slice_mm_new_context(mm))
slice_set_user_psize(mm, mmu_virtual_psize);
subpage_prot_init_new_context(mm);
mm->context.id = index;
#ifdef CONFIG_PPC_ICSWX
mm->context.cop_lockp = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
if (!mm->context.cop_lockp) {
__destroy_context(index);
subpage_prot_free(mm);
mm->context.id = MMU_NO_CONTEXT;
return -ENOMEM;
}
spin_lock_init(mm->context.cop_lockp);
#endif /* CONFIG_PPC_ICSWX */
return 0;
}
/*
* Set up the context for a new address space.
*/
int init_new_context(struct task_struct *t, struct mm_struct *mm)
{
pr_hard("initing context for mm @%p\n", mm);
mm->context.id = MMU_NO_CONTEXT;
mm->context.active = 0;
#ifdef CONFIG_PPC_MM_SLICES
if (slice_mm_new_context(mm))
slice_set_user_psize(mm, mmu_virtual_psize);
#endif
return 0;
}
